189145009 has 9 divisors (see below), whose sum is σ = 201174337. Its totient is φ = 177798784.

The previous prime is 189145007. The next prime is 189145027. The reversal of 189145009 is 900541981.

The square root of 189145009 is 13753.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 83631025 + 105513984 = 9145^2 + 10272^2 .

It is not a de Polignac number, because 189145009 - 2¹ = 189145007 is a prime.

It is a super-2 number, since 2×189145009² = 71551668859220162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (189145001) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 233397 + ... + 234205.

Almost surely, 2^189145009 is an apocalyptic number.

189145009 is the 13753-rd square number.

189145009 is the 6877-th centered octagonal number.

It is an amenable number.

189145009 is a deficient number, since it is larger than the sum of its proper divisors (12029328).

189145009 is an frugal number, since it uses more digits than its factorization.

189145009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1652 (or 826 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 37.

The cubic root of 189145009 is about 574.0260856919.

The spelling of 189145009 in words is "one hundred eighty-nine million, one hundred forty-five thousand, nine".